121 lines
3.3 KiB
Ruby
121 lines
3.3 KiB
Ruby
# -*- coding: binary -*-
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##
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#
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# Net::DNS::RR::A
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#
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# $id$
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#
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##
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require 'ipaddr'
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module Net # :nodoc:
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module DNS
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class RR
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# =Name
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#
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# Net::DNS::RR::A DNS A resource record
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#
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# =Synopsis
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#
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# require "net/dns/rr"
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#
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# =Description
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#
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# Net::DNS::RR::A is the class to handle resource records of type A, the
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# most common in a DNS query. Its resource data is an IPv4 (i.e. 32 bit
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# long) address, hold in the instance variable +address+.
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# a = Net::DNS::RR::A.new("localhost.movie.edu. 360 IN A 127.0.0.1")
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#
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# a = Net::DNS::RR::A.new(:name => "localhost.movie.edu.",
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# :ttl => 360,
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# :cls => Net::DNS::IN,
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# :type => Net::DNS::A,
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# :address => "127.0.0.1")
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#
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# When computing binary data to trasmit the RR, the RDATA section is an
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# Internet address expressed as four decimal numbers separated by dots
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# without any imbedded spaces (e.g.,"10.2.0.52" or "192.0.5.6").
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#
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class A < RR
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attr_reader :address
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# Assign to the RR::A object a new IPv4 address, which can be in the
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# form of a string or an IPAddr object
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#
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# a.address = "192.168.0.1"
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# a.address = IPAddr.new("10.0.0.1")
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#
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def address=(addr)
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@address = check_address addr
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build_pack
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end # address=
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private
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def check_address(addr)
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address = ""
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case addr
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when String
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address = IPAddr.new addr
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when Integer # Address in numeric form
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tempAddr = [(addr>>24),(addr>>16)&0xFF,(addr>>8)&0xFF,addr&0xFF]
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tempAddr = tempAddr.collect {|x| x.to_s}.join(".")
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address = IPAddr.new tempAddr
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when IPAddr
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address = addr
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else
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raise RRArgumentError, "Unknown address type: #{addr}"
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end
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raise RRArgumentError, "Must specify an IPv4 address" unless address.ipv4?
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address
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rescue ArgumentError
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raise RRArgumentError, "Invalid address #{addr}"
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end
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def build_pack
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@address_pack = @address.hton
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@rdlength = @address_pack.size
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end
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def set_type
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@type = Net::DNS::RR::Types.new("A")
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end
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def get_data
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@address_pack
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end
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def get_inspect
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"#@address"
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end
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def subclass_new_from_hash(args)
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if args.has_key? :address
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@address = check_address args[:address]
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elsif args.has_key? :rdata
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@address = check_address args[:rdata]
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else
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# Address field is mandatory
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raise RRArgumentError, ":address field is mandatory but missing"
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end
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end
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def subclass_new_from_string(str)
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@address = check_address(str)
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end
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def subclass_new_from_binary(data,offset)
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a,b,c,d = data.unpack("@#{offset} CCCC")
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@address = IPAddr.new "#{a}.#{b}.#{c}.#{d}"
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return offset + 4
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end
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end # class A
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end # class RR
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end # module DNS
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end # module Net
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